18 IMT Electric-Hydraulic Crane Operation & Safety Manual # 99903618
Anti-Two-Block System
If your crane is equipped with power extension, it has a switch which stops the boom extension,
hoist up and boom down functions. This switch is connected to a hanging weight at the crown
block of the boom. It is activated before the traveling block can come in contact with the boom
crown. This system is designed to be failsafe in that if any of the components should fail or
become disconnected, the target functions will not work until it is replaced, repaired or
reconnected. If the operator is in doubt as to whether the anti-two-block system is working
properly, he should contact his supervisor immediately.
Operation in Adverse Conditions
Operating your crane in adverse weather conditions can affect the crane performance. Please
note the following operation procedures for adverse weather conditions.
1 Dusty and Sandy Areas - Operating in dusty or sandy areas presents special problems due
to the abrasive action of dust which shortens the life of parts. Make every effort to keep dust
and sand out of the moving parts of the crane machinery and engine. Keep lubricants clean,
and lubrication and fluid fill areas capped tightly.
2 High Humidity and Salt Air - Moisture and salt will cause deterioration of paint, cables, wiring
and all exposed metallic parts. Keep parts dry and well lubricated in high humidity or salt air
conditions. Keep parts thoroughly lubricated, and remove rust and corrosion if and when it
appears.
3 High Altitudes - Operation at high altitudes presents special problems due to lower
atmospheric pressure and wide temperature ranges. Consult the vehicle owner’s manual
regarding operating the vehicle at high altitudes.
Cold Weather
For cold weather operation with temperatures of -25º F or lower, the following procedures must
be followed:
1 Start the truck and run at manufacturer’s recommended idle speed for proper warm up.
2 After approximately 45 minutes of truck warm up time, engage the PTO.
3 With the PTO fully engaged and the truck engine running at idle speed, let the hydraulic
system oil circulate.
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